What is dynamic range in photography?
In photography dynamic range refers to a camera’s ability to record shadow and highlight details at the same time.
It’s how well your camera captures light.
Why you need to understand dynamic range
It’s all about exposure, so if you want well exposed photos, you need to know about dynamic range. You’ll have a good understanding of your camera’s capabilities and what you can do to achieve a good exposure if you can understand:
- what dynamic range is
- what affects it
- and how to manipulate it
Like with everything in photography, when you know how something works you can control the outcome…and create images as you see them in your mind.
Your camera’s dynamic range
Not all cameras have the same dynamic range. Far from it, because the dynamic range of a camera is determined by the sensor.
Compact cameras don’t have as wide a dynamic range as DSLRs, because the sensor is smaller. Full frame DSLRs have a much greater dynamic range than crop frame cameras.
High end full frame cameras are able to record a higher dynamic range than entry level cameras, but even among the high end cameras some are better than others. More on this in a moment.
How is dynamic range in photography measured?
Dynamic range is measured in stops. It’s the same as when talking about adjusting the f-stop for aperture. Each f-stop is double (or half, depending on which way you’re going) the one before. In other words, F2.8 is double the brightness level of F4.
So, getting back to what I was saying a moment ago about how dynamic range varies between cameras…
The dynamic range of:
- My old Nikon D700 (full frame camera) is 8 stops
- Nikon D810 (full frame camera) is 15 stops
- The human eye is about 20 stops
This is why we see better than our cameras – we can see much more detail from the darkest blacks through to the brightest whites.
The scene’s dynamic range
But there’s one more aspect to dynamic range – the dynamic range of the subject, or scene.
Here the dynamic range is the difference between the light intensities of the shadows and the highlights. Compare:
- A high contrast, cloud-free sunny day – lots of bright sunlight and dark shadows – really high dynamic range
- A low contrast, heavily overcast day – no shadows – easier to photograph, because it fits within the dynamic range of your camera
So, the sunnier it is, the brighter the highlights will be and the stronger the shadows will be, and the greater the dynamic range of the scene.
What if it’s too bright for my camera?
If your camera is not able to record both the highlights and the shadows of the scene, you’ll have to make a choice about what is important to avoid clipping (detail not being recorded).
- If you expose for the highlights, you’ll lose detail in the shadows as they’ll be underexposed, or blocked
- If you expose for the shadows, you’ll lose detail in the highlights as they’ll be overexposed, or blown out
How to manage dynamic range
Regardless of your camera’s abilities, there will come a time when a scene is beyond the capabilities of your camera’s dynamic range.
Once you know your camera, and more specifically it’s limitations, you can start to learn how to work with it. When it comes to dynamic range, there are many things you can do, but they can be summed up into three choices:
- Reduce the contrast
- Avoid the contrast
- Embrace the contrast
1. Reduce the dynamic range of a scene
When you reduce the contrast of a scene, you reduce the dynamic range in photography.
If you refer back to the diagram at the top of the article, you’ll see that if the shadows are lighter, or the highlights are darker, or both, the dynamic range of the scene is less. As a result it’s easier for your camera to accurately record both the light and dark areas without overexposing highlights or underexposing shadows.
There are two ways to reduce the dynamic range of a scene:
a) Lighten shadows
To “lift” the shadows add in light so they are closer in brightness to the more illuminated areas of a scene.
To lighten shadows:
- Use a reflector and bounce light back into the dark part of the scene
- Use flash to light the dark part of the scene
- Shoot in RAW and adjust the shadow slider up in post production
- Adjust in post production using processing software such as Lightroom
Product and portrait photographers manipulate light in the studio and on location with the use of reflectors and strobes to light the subject and/or fill in the shadows.
b) Darken highlights
Alternatively, you can work on the other end of the dynamic range to reduce the highlights. In other words, make the highlights darker.
To reduce highlights:
- Use a diffuser to block some of the light
- Use a graduated ND filter to darken a bright sky
- Shoot in RAW and adjust the highlights slider down in post production
The challenge with landscape photography is that the sky is significantly brighter than the land. So landscape photographers use graduated neutral density filters to reduce the dynamic range of the scene so that they can capture both a well exposed sky and land.
2. Avoid high contrast scenes
By photographing in a less “contrasty” area, you won’t have to deal with the extremes of highlights and shadows.
This is why portrait photographers:
- Position subjects in shade
- Don’t photograph in the midday sun when it is brightest
- Photograph with the sun behind subjects so that their faces are in shadow
If you’ve ever worked at trying to avoid harsh shadows in photos, you’ve been accommodating your camera’s dynamic range.
In the photo on the left I exposed for the door frame and in the photo on the right I exposed for the scene outside.
3. Embrace the dynamic range of a scene
There’s another way to deal with a scene when it’s beyond the dynamic range of your camera. Embrace it with HDR.
With HDR photography (High Dynamic Range photography) you take several photos at different exposures to combine into one HDR image with details in the:
In this way you overcome the shortcomings of your camera for the best of all worlds and get an image that mimics how our eyes see the world.
Real estate photographers use HDR, to show a room interior correctly exposed with the view through the window also correctly exposed, instead of being blown out.
By stacking photos with different exposures that cover both the interior and the exterior, the full dynamic range can be shown. Potential buyers looking at the photos see the home represented as close as possible to the way their eyes would see it if they were there.
A camera would not be able to capture the full dynamic range.
When new photographers first come across the term dynamic range, it’s usually because they learn about HDR photography.
Getting creative with dynamic range in photography
Generally, the consensus on exposure is that, if you have to make a choice:
- it’s okay not to record details in the darkest part of an image
- but it’s not okay to overexpose the highlights to the point of losing detail
But photography is also about personal style. You don’t have to record the full dynamic range of a scene and you don’t have to ensure that the highlights aren’t clipped.
If you know how to control both the highlights and the shadows, and decide to expose for one at the expense of the other, that’s a creative choice.
Understanding dynamic range is key to making these creative decisions and getting the results you want.
In the image above the shadows were blocked to create a silhouette. Below I allowed the highlights to be blown out.
Dynamic range and camera choice
When digital photography first started the emphasis was on megapixels. But there are just so many megapixels that you need and for some years now we’ve had more than enough megapixels in most cameras for most photographers.
Manufacturers have been working on dynamic range, because this is what really matters to photographers. Luckily for us, the dynamic range of cameras has steadily grown and I wouldn’t be surprised if one day we’re using cameras able to record the world as well as our eyes see it.
I suggest, when buying your next camera, pay attention to the dynamic range of the camera rather than megapixels.
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By Jane Allan
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